colloidal

a. A system in whichfinelydividedparticles,whichareapproximately 1 to 1,000millimicrons in size,aredispersedwithin a continuousmedium in a mannerthatpreventsthemfrombeingfilteredeasily or settledrapidly.

b. Theparticulatematter so dispersed.

2. Thegelatinousstoredsecretion of thethyroidgland,consistingmainly of thyroglobulin.